It definitely varies per person... Find out what your goal is, and write as many prep-tests as it takes for you to reach this goal. Many advise a minimum of 10 full LSAT prep-tests under timed condition, but again, that varies per individual.
It varies a lot between people. The most important part is to properly review so that you don't make the same mistakes as you did before. I would definitely do at least 20 if you have the time.
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Find out what your goal is, and write as many prep-tests as it takes for you to reach this goal.
Many advise a minimum of 10 full LSAT prep-tests under timed condition, but again, that varies per individual.